A friend of mine had an old Ibanez Gio with the fretboard lifting off the neck. Rather than remove the whole fretboard I just lifted it and cleaned it out the best I could. Next, I used hide glue to reattach the fretboard and clamped it for 24 hours. Below are the before and after photos.

I still need to clean it up and I spoke with him about getting a new nut on there (as you can see he put a hurting on the thing!) I am going to go ahead and do that. Hope this helps someone.